Mindmeister: Another collaborative mind-mapping site. Offers various templates for brainstorming formats. Invite others by email - they will be prompted to create an account if they do not already have one. Track changes by "history view" at the bottom of the screen.

Polling

ALA Connect Group spaces within ALAConnect have a simple polling function. It allows for multiple choice, single answer questions.

SurveyMonkey: Allows creation of very complicated surveys with a variety of ways to invite responses. Really not for simple small group polling, but very good when collecting data from a large, disperse group.